Y-shaped secreted BCR: two heavy + two light chains, variable antigen-binding (Fab) + constant (Fc) regions. Five classes: IgM (first), IgG (majority serum), IgA (mucosal), IgE (allergy/parasite), IgD.
Y-shaped secreted BCR: two heavy + two light chains, variable antigen-binding (Fab) + constant (Fc) regions. Five classes: IgM (first), IgG (majority serum), IgA (mucosal), IgE (allergy/parasite), IgD.